package day07;

import java.awt.font.FontRenderContext;

public class Ver {
    public static void main(String[] args) {

        }
    public static String generateVeriCode(int len){
        String code ="";
        char[]chs={'a','b','c','d','e','f','g','h','i','j'
                , 'k','l','m','n','o','p','q','r','s','t'
                ,'u','v','w','x','y','z','A','B','C','D','E'
                ,'F','G','H','I','J','K','L','M','N','O','P'
                ,'Q','R','S','T','U','V','W','X','Y','Z'
                ,'1','2','3','4','5','6','7','8','9'};
        for (int i=1;i<=len;i++){
            int index=(int)(Math.random()*chs.length);
            code +=chs[index];
        }
        return code;
    }
}
